Fixes the issue with the checker framework

samples/client/3_0_3_unit_test/java_simplified/src/main/java/org/openapijsonschematools/client/schemas/validation/JsonSchema.java

@@ -23,19 +23,4 @@ public abstract class JsonSchema {
     protected JsonSchema(JsonSchemaInfo jsonSchemaInfo) {
         this.type = jsonSchemaInfo.type;
     }
-
-    public static class PathToSchemasMap extends LinkedHashMap<List<Object>, LinkedHashMap<JsonSchema, Void>> {
-
-        public void update(PathToSchemasMap other) {
-            for (Map.Entry<List<Object>, LinkedHashMap<JsonSchema, Void>> entry: other.entrySet()) {
-                List<Object> pathToItem = entry.getKey();
-                LinkedHashMap<JsonSchema, Void> otherSchemas = entry.getValue();
-                if (containsKey(pathToItem)) {
-                    get(pathToItem).putAll(otherSchemas);
-                } else {
-                    put(pathToItem, otherSchemas);
-                }
-            }
-        }
-    }
 }